title: Response of multicellular tumor spheroids to multiple fractions of negative pi mesons and X rays.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004307:Dose-Response Relationship, Radiation; D004601:Elementary Particles; D008175:Lung Neoplasms / Q000532:radiotherapy*; D008325:Mammary Neoplasms, Experimental / Q000532:radiotherapy*; D051379:Mice; D011882:Radiotherapy, High-Energy; D012062:Relative Biological Effectiveness; D014965:X-Rays